Does anyone use this supplement? If so, do you find it effective at all for helping your anxiety/depression?

It can be effective for mild anxiety and depression, but it is not going to stop severe anxiety, panic attacks, etc.

Be aware that SJW may interact with many medications (partial list, more comprehensive) so seek the advice of your pharmacist or doctor if you are taking any meds, including over-the=counter ones, and SJW and alcohol can be problematic too.

NOTE: I'm not a doctor, and particularly not yours, so there may be factors I'm unaware of. Therefore all advice is of a general nature and you should consult your doctor before following any of it, especially before changing med doses.